Although many experts believe the naturally occurring rate of ADHD is somewhere in the neighborhood of 5 to 6 percent of the population, data from the Centers for Disease Control and Prevention (CDC) show that the diagnosis is being made at twofold rates, or in about 11 percent of American youth. But from Sara’s perspective, just about everyone on campus was using Adderall, regardless of whether they had an ADHD diagnosis or a prescription for the drug.